激光与光电子学进展, 2020, 57 (17): 172702, 网络出版: 2020-09-01
沙尘暴背景下基于最优纠缠度的双卫星星地链路切换策略 下载: 828次
Switching Strategy of Dual-Satellite Satellite-Ground Link Based on Optimal Entanglement Degree in Background of Sandstorm
量子光学 量子卫星通信 最优纠缠度 双卫星星地链路 量子卫星切换算法 沙尘暴 quantum optics quantum satellite communication optimal entanglement degree dual-satellite satellite-ground link quantum satellite switching algorithm sand storm
摘要
在量子卫星通信过程中,量子卫星与地面接收机之间的星地链路会受到雨雪、沙尘、雾霾、电离层等自然因素的影响,导致通信质量降低。然而,有关沙尘暴背景下量子卫星星地链路切换策略的研究鲜有报道。为了降低沙尘暴对星地链路切换的影响,提出了基于最优纠缠度的双卫星星地链路切换策略。通过建立沙尘暴各项参数与星地链路纠缠度的关系,分析了沙尘扩散模式指数、沙尘粒子半径、观测高度和沙尘灾害系数对链路纠缠度的影响。根据沙尘背景下的星地链路纠缠度,提出了一种新的切换策略,即在当前双卫星为一个地面用户服务的情况下,从多个备选卫星中选择一颗纠缠度最大的卫星作为链路将要切换的最优目标卫星。仿真结果表明,沙尘扩散模式指数、沙尘粒子半径、观测高度和沙尘灾害系数均会对链路纠缠度产生明显的影响,所提出的基于最优纠缠度的双卫星星地链路切换策略可以降低沙尘暴对纠缠度的影响,且在切换的过程中没有链路中断现象。因此,采用最优星地链路纠缠度的切换策略,能够有效提高链路通信质量。
Abstract
In the process of quantum satellite communication, the satellite link between the quantum satellite and the ground receiver is inevitably affected by the natural factors such as rain, snow, dust, haze, and ionosphere, which results in a decrease in communication quality. However, the research on the switching strategy of quantum satellite satellite-ground links is still few in the context of dust storms. In order to reduce the effect of dust storm on the switching of satellite-ground links, we propose a switching strategy of dual-satellite satellite-ground links based on optimal entanglement. By establishing the relationship between the parameters of sandstorm and the entanglement degree of satellite-ground links, the effects of dust diffusion mode index, dust particle radius, observation height, and sand disaster coefficient on the entanglement of links are analyzed. According to the entanglement of satellite-ground links in the context of sandstorm, a new switching strategy is proposed, that is, in the case that the current dual-satellite serves a ground user, one satellite with the largest entanglement degree is selected from the multiple candidate satellites as the optimal target satellite to be switched by the link. The simulation results show that the sand dust diffusion mode index, sand particle radius, observation height, and dust disaster coefficient can lead to the significant change of entanglement degree of links. The proposed optimal entanglement-based switching strategy of dual-satellite satellite-ground links can not only reduce the impact of sandstorm on the entanglement degree, but also make link interruption disappear during the switching process. Thus the switching strategy based on the optimal entanglement degree of satellite-ground link can effectively improve the communication quality of links.
聂敏, 寇文翔, 杨光, 张美玲, 孙爱晶, 裴昌幸. 沙尘暴背景下基于最优纠缠度的双卫星星地链路切换策略[J]. 激光与光电子学进展, 2020, 57(17): 172702. Min Nie, Wenxiang Kou, Guang Yang, Meiling Zhang, Aijing Sun, Changxing Pei. Switching Strategy of Dual-Satellite Satellite-Ground Link Based on Optimal Entanglement Degree in Background of Sandstorm[J]. Laser & Optoelectronics Progress, 2020, 57(17): 172702.